GPT 5.4 — AI Text Generator

About GPT 5.4

Features

• 1,050,000-token context window with up to 128,000 output tokens.
• Native computer-use tooling alongside web search, file search, code interpreter, hosted shell, and MCP support in the API.
• Reasoning effort selectable from none through xhigh.
• Accepts text and image input; outputs text.
• Four variants: Thinking, Pro, mini (free-tier), and nano (API-only).
• Knowledge cutoff of August 31, 2025.

What people use it for

• Agent workflows that drive real applications through screenshots, mouse, and keyboard.
• Deep research tasks, an area OpenAI specifically upgraded in this release.
• Coding and professional document work over very long context.
• Tool-heavy pipelines that benefit from the built-in tool search mechanism.

Reported strengths

• State-of-the-art computer use at release: 75% on OSWorld-Verified, past the measured human baseline.
• 33% fewer factual errors than GPT-5.2, continuing the line's hallucination reductions.
• A context window over 1 million tokens, roughly 2.5x GPT-5.2's.
• Reception praised its token-efficient responses and low hallucination rate.

Reported limitations

• Users reported that it sometimes does not follow prompts accurately, a criticism recorded in Wikipedia's reception summary.
• The mini and nano variants cost about four times as much through the API as their GPT-5 counterparts did, drawing pricing complaints.
• Prompts over 272,000 input tokens are billed at elevated rates for the whole session, so the million-token window carries a surcharge in practice.
• Its knowledge cutoff of August 31, 2025 sits half a year behind the release date.

Sources

1. GPT-5.4 (Wikipedia)
2. GPT-5.4 Model (OpenAI)